Upgrade Mime Types gem
Upgrade Mime Types gem

This deprecation warning was being printed:

    mime-types-3.1/lib/mime/types/logger.rb:28: warning: `_1' is
    reserved for numbered parameter; consider another name

The changes are minor:
https://github.com/mime-types/ruby-mime-types/blob/master/History.md

getguesstimate/guesstimate-server,getguesstimate/guesstimate-server,getguesstimate/guesstimate-server